[NHCOLL-L:5893] RE: Geology specimen identification

[Elizabeth Nunan]

I also ran it by our geologists/mineralogists and got the following: 

"looks like sandstone, or a concretion of some sort"

"It
 looks comprised of many layers indicative of a sedimentary rock or a 
volcanic rock.  Many processes that operate to form sedimentary
rocks also operate to form volcanic rocks.  It can be tricky to tell the
 difference between the two without a thin section.  
"


Elizabeth Nunan


Associate Conservator


Natural Science Conservation


American Museum of Natural History


212.313.7532

--- On Wed, 3/14/12, Shelton, Sally Y. <Sally.Shelton at sdsmt.edu> wrote:

From: Shelton, Sally Y. <Sally.Shelton at sdsmt.edu>
Subject: [NHCOLL-L:5890] RE: Geology specimen identification
To: "AshleyH at cctexas.com" <AshleyH at cctexas.com>, "nhcoll-l at lists.yale.edu" <nhcoll-l at lists.yale.edu>
Date: Wednesday, March 14, 2012, 8:52 AM

I ran this past one of our geologists and received this response:   From: Fox, James E. 
Sent: Tuesday, March 13, 2012 7:31 PM
To: Shelton, Sally Y.
Subject: RE: Geology specimen identification   Hi Sally,  Greetings from El Paso.. The photo looks like "locally" cemented layers of beach sandstone...the surrounding sands were not cemented and thus easily eroded away.  Localized cementation such as this is not that uncommon.Jim Fox     Sally Y. Shelton, Collections Manager and Faculty InstructorMuseum of Geology and Paleontology Research LaboratorySouth Dakota School of Mines and Technology501 E. St. JosephRapid City, SD   57701Sally.Shelton at sdsmt.edu605.394.2487      From: owner-nhcoll-l at lists.yale.edu [mailto:owner-nhcoll-l at lists.yale.edu] On Behalf Of Ashley Henderson
Sent: Tuesday, March 13, 2012 3:53 PM
To: nhcoll-l at lists.yale.edu
Subject: [NHCOLL-L:5889] Geology specimen identification  Dear list,We had a woman offer a donation which she says a geologist identified as a fulgurite.  I have attached an image of the specimen.   Our only staff member with a small background in geology says this is not a fulgurite and it indeed does not match any image or description of one that we can find.  However, she cannot identify what it actually is.  Can anyone out there identify this specimen.  It was found on a beach, partly covered in sand.  Thanks in advance for any information.  Best Regards,  Ashley   Ashley HendersonCollection ManagerCorpus Christi Museumof Science and History361-826-4659  Visit us on FacebookExplore our online collection  
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